Physics Quiz: Current Electricity Trivia Questions!

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Padasalaiphysics
P
Padasalaiphysics
Community Contributor
Quizzes Created: 9 | Total Attempts: 47,964
| Attempts: 7,045
SettingsSettings
Please wait...
  • 1/10 Questions

    The material through which electric charge can flow easily is

    • Copper
    • Germanium
    • Quartz
    • Mica
Please wait...
About This Quiz

Dive into the fundamentals of current electricity with this engaging Physics Quiz! Test your understanding of electrical concepts like current, resistance, and power through practical questions. Ideal for students looking to reinforce their knowledge and prepare for advanced studies.

Physics Quiz: Current Electricity Trivia Questions! - Quiz

Quiz Preview

  • 2. 

    A toaster operating at 240V has a resistance of 120Ω. The power is

    • 480 W

    • 400 W

    • 2 W

    • 240 W

    Correct Answer
    A. 480 W
    Explanation
    The power of an electrical device can be calculated using the formula P = V^2/R, where P is power, V is voltage, and R is resistance. In this case, the voltage is given as 240V and the resistance is given as 120Ω. Plugging these values into the formula, we get P = (240^2) / 120 = 480W. Therefore, the correct answer is 480W.

    Rate this question:

  • 3. 

    The current flowing in a conductor is proportional to

    • Drift velocity

    • 1/ area of cross section

    • 1/no of electrons

    • Square of area of cross section.

    Correct Answer
    A. Drift velocity
    Explanation
    The current flowing in a conductor is proportional to drift velocity because drift velocity is the average velocity at which free electrons move in a conductor due to an applied electric field. As more electrons move with a higher drift velocity, the overall current in the conductor increases. Therefore, the greater the drift velocity, the greater the current flowing in the conductor.

    Rate this question:

  • 4. 

    In the case of insulators, as the temperature decreases, resistivity

    • Increases

    • Becomes zero

    • Decreases

    • Remains constant

    Correct Answer
    A. Increases
    Explanation
    As the temperature decreases in the case of insulators, the resistivity increases. This is because insulators have a large energy band gap between their valence band and conduction band. At higher temperatures, more electrons are able to gain enough energy to jump from the valence band to the conduction band, allowing for better conductivity. However, as the temperature decreases, the number of electrons with enough energy decreases, leading to a decrease in conductivity and an increase in resistivity.

    Rate this question:

  • 5. 

    When n resistors of equal resistances (R) are connected in series, the effective resistance is

    • NR

    • 1/nR

    • R/n

    • N/R

    Correct Answer
    A. NR
    Explanation
    When n resistors of equal resistances (R) are connected in series, the effective resistance is the sum of the resistances of all the resistors. Since all the resistors have the same resistance (R), the effective resistance would be n times the resistance of each resistor (R). Therefore, the correct answer is nR.

    Rate this question:

  • 6. 

    If the length of a copper wire has a certain resistance R, then on doubling the length its specific resistance

    • Will remain the same

    • Will be doubled

    • Will become 1/4 th

    • Will become 4 times

    Correct Answer
    A. Will remain the same
    Explanation
    The specific resistance of a material is a constant property that depends on the material itself, not on its length. Therefore, doubling the length of a copper wire will not change its specific resistance.

    Rate this question:

  • 7. 

    When two 2Ω resistances are in parallel, the effective resistance is

    • 1 Ω

    • 2 Ω

    • 0.5 Ω

    • 4 Ω

    Correct Answer
    A. 1 Ω
    Explanation
    When two resistances are in parallel, the effective resistance is given by the formula 1/Reff = 1/R1 + 1/R2. In this case, both resistances are 2Ω. Plugging in the values, we get 1/Reff = 1/2Ω + 1/2Ω = 2/2Ω = 1Ω. Therefore, the effective resistance when two 2Ω resistances are in parallel is 1Ω.

    Rate this question:

  • 8. 

    Charge of 60 C passes through an electric lamp in 2 minutes. Then the current in the lamp is

    • 0.5 A

    • 30 A

    • 1 A

    • 5A

    Correct Answer
    A. 0.5 A
    Explanation
    The current in the lamp can be calculated by dividing the charge passing through it by the time taken. In this case, the charge is given as 60 C and the time is given as 2 minutes. Converting the time to seconds (2 minutes = 120 seconds), we can calculate the current as 60 C / 120 s = 0.5 A. Therefore, the current in the lamp is 0.5 A.

    Rate this question:

  • 9. 
    If the resistance of a coil is 2 Ω at and α = 0.004 /, then its resistance at  is - ProProfs

    If the resistance of a coil is 2 Ω at and α = 0.004 /, then its resistance at  is

    • 2.8 Ω

    • 0 Ω

    • 1.4 Ω

    • 4 Ω

    Correct Answer
    A. 2.8 Ω
    Explanation
    The resistance of a coil is directly proportional to its temperature coefficient, which is represented by the symbol α. In this case, the temperature coefficient α is given as 0.004 /°C. Since the temperature is not provided in the question, we can assume that it remains constant. Therefore, if the resistance at is 2 Ω, the resistance at will be 2 Ω * (1 + α * ΔT), where ΔT is the change in temperature. Since ΔT is not given, we can assume it to be 0, which means there is no change in temperature. Therefore, the resistance at will be 2 Ω * (1 + 0.004 * 0) = 2 Ω. Thus, the correct answer is 2 Ω.

    Rate this question:

  • 10. 

    According to Faraday’s law of electrolysis, when a current is passed, the mass of ions deposited at the cathode is independent of

    • Resistance

    • Time

    • Charge

    • Current

    Correct Answer
    A. Resistance
    Explanation
    According to Faraday's law of electrolysis, the mass of ions deposited at the cathode is independent of resistance. This means that the amount of substance deposited during electrolysis is determined by the quantity of charge passing through the electrolyte, rather than the resistance of the circuit. In other words, the mass of ions deposited at the cathode is directly proportional to the amount of electric charge passing through the electrolyte, regardless of the resistance in the circuit.

    Rate this question:

Quiz Review Timeline (Updated): Mar 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 01, 2013
    Quiz Created by
    Padasalaiphysics
Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.